A block of iron has a mass of 826 g. What is the volume of the block of iron whose density at 25°C is 7.9 ?
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Answer:
Explanation:
There are eight isotopes of lawrencium, and they are all radioactive,
I will do the calculation for ²⁶²Lr, which has a half-life of 3.6 h.
Let A₀ = the original amount of lawrencium.
The amount remaining after one half-life is ½A₀.
After two half-lives, the amount remaining is ½ ×½A₀ = (½)²A₀.
After three half-lives, the amount remaining is ½ ×(½)²A₀ = (½)³A₀, and so on.
We can write a general formula for the amount remaining:
A =A₀(½)ⁿ
where n is the number of half-lives
Data:
A₀ = 5 g
t = 30 min
Calculations:
(a) Convert the half-life to minutes
(b) Calculate n
(c) Calculate A